Add error message to build description

Change-Id: Ifffce007fbe9d3bc47ea57c30ee652b5e0bdb680
diff --git a/test-salt-model-node.groovy b/test-salt-model-node.groovy
index 913bae9..890630f 100644
--- a/test-salt-model-node.groovy
+++ b/test-salt-model-node.groovy
@@ -60,6 +60,7 @@
   } catch (Throwable e) {
      // If there was an error or exception thrown, the build failed
      currentBuild.result = "FAILURE"
+     currentBuild.description = e.message
      throw e
   }
 }